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in 1942 Rust Craft published a booklet "Mail From Home" to give tips for correspondence with soldiers. this 16 page booklet could be picked-up at your local card shop..providing they were 'authorized Rust Craft dealers' or consumers could mail away for it directly through RC.
The greeting card industry was heavily involved with supporting the war effort and Rust Craft, as one of it's leaders, published lots of related materials.